Patent GB-190522874-A (GB)
Title: Improvements in Printing Telegraphs
Inventor: KAMM LEO
Filed: 1905-11-08
Granted: 1906-11-08
Abstract: 22,874. Kamm, L. Nov. 8. Telegraphs.-Relates to improvements in. the details of the printing telegraphs described in Specifications No. 3531, A.D. 1895, No. 12,013, A.D. 1898, and No. 6042, A.D. 1901, in which on depression of a key at the transmitting-station an arm is set free at both transmitting and receiving stations, and rotates at the transmitter until it engages a pin raised by the depression of the key, thereby closing a line circuit to arrest the arm at the receiving-station, and close a local printing-circuit. The arm is returned to its zero position by a zero magnet after printing each letter. The improvements are as follows :-(1) A dash-pot is used for regulating the duration of the line current sent on depression of a key. (2) The synchronizing-arm of the receiver is provided with a hook-shaped plunger whereby the arm remains in contact with the pin until returned by the zero magnet. (3) To prevent the rebound of the synchronizing-arm on engaging a raised pin at the transmitter, the arm is provided with a locking-device consisting of a pivoted hook-shaped weight, which engages the pin by its own momentum when the arm strikes the pin, and is removed immediately by a small antagonistic spring. (4) The chain which returns the spindle of the synchronizing-shaft to zero is connected to the armature of the zero magnet by a spring to prevent sudden jerk. (5) The ink roller o<2>, Fig. 9, is mounted on the roller o<1>, which carries an armature o of the zero magnet f, so that, when this magnet is energized, the roller inks the type, arranged in the form of a segment. (6) The line magnet is enclosed in a metal box, on the lid of which is mounted the fulcrum of the armature so as to facilitate adjustment and removal of the parts. (7) To ensure the circuit of the zero magnet remaining closed until the synchronizing- arm is returned completely to zero, the contacts controlling this circuit are acted on by a catch lever, which is depressed by the synchronizing-arm when it reaches its zero position. (8) When used for page printing, the paper-carriage g is mounted on two horizontal rods g<1>, and is returned to its initial position at the end of the line by the spring drum g<2> and chain g<3>. The paper-roller h carries a line-spacing ratchet-wheel h<#>, Fig. 9, rotated by a pawl h<2> upon a reciprocating rod h<3> engaging at its lower end an horizontal rod h<4>, Figs. 9 and 12, carried by crank-arms h<5> on the shaft h<6> rotated by the movement of the armature h<8> of the column magnet h<7>. A stop pin t on the rod h<3> engages the pawl h<2> when the latter is moved down by the rod h<3> so as to look it against the ratchet-wheel to prevent overrunning. Lateral movement of the carriage is effected by a lever r carrying a roller r', Fig. 8, engaged by a cam r<2>, on the connecting-rod i<2> of the armature i<1> of the printing-magnet. During the return stroke of this armature, the lever r is forced down by the action of the cam, and moves the carriage one step by means of the pawl r<3>. When a new line of printing is required, the synchronizing - arm is allowed to rotate to the fullest extent by depressing one of the transmitting-keys and releasing it before the arm reaches it. Under these conditions, the synchronizing-arm closes a contact in the circuit of the column magnet h<7>, thus turning the roller h one step and at the same time removing the retaining- pawl r<5> so that the carriage is returned laterally by the spring drum g<2>. To prevent rebound of the carriage, a hook-shaped lever u, Fig. 12, is carried by a wire arm u<1> which is knocked back by the carriage, causing the hook u to engage the carriage check u<2> during the moment of recoil, after which the hook drops to its normal position. During the return movement of the carriage, an inclined projection s<4> engages a roller so as to break the contact in the circuit of the column magnet, which contact had been previously made by the synchronizing-arm. A flat removable bar, against which the types are struck, may be placed between the paper and the rubber roller h. To obtain a more perfect action of the finger key rocking frame d, Fig. 9, the latter is carried by two vertical bars v, pivoted to two pairs of horizontal bars v<1>, two of which only are shown in Fig. 9.